| /* |
| * Copyright (c) 2018 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "bsf.h" |
| #include "bsf_internal.h" |
| #include "get_bits.h" |
| #include "ac3_parser_internal.h" |
| |
| static int eac3_core_filter(AVBSFContext *ctx, AVPacket *pkt) |
| { |
| AC3HeaderInfo hdr; |
| GetBitContext gbc; |
| int ret; |
| |
| ret = ff_bsf_get_packet_ref(ctx, pkt); |
| if (ret < 0) |
| return ret; |
| ret = init_get_bits8(&gbc, pkt->data, pkt->size); |
| if (ret < 0) |
| goto fail; |
| |
| ret = ff_ac3_parse_header(&gbc, &hdr); |
| if (ret < 0) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| if (hdr.frame_type == EAC3_FRAME_TYPE_INDEPENDENT || |
| hdr.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) { |
| pkt->size = FFMIN(hdr.frame_size, pkt->size); |
| } else if (hdr.frame_type == EAC3_FRAME_TYPE_DEPENDENT && pkt->size > hdr.frame_size) { |
| AC3HeaderInfo hdr2; |
| |
| ret = init_get_bits8(&gbc, pkt->data + hdr.frame_size, pkt->size - hdr.frame_size); |
| if (ret < 0) |
| goto fail; |
| |
| ret = ff_ac3_parse_header(&gbc, &hdr2); |
| if (ret < 0) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| if (hdr2.frame_type == EAC3_FRAME_TYPE_INDEPENDENT || |
| hdr2.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) { |
| pkt->size -= hdr.frame_size; |
| pkt->data += hdr.frame_size; |
| } else { |
| pkt->size = 0; |
| } |
| } else { |
| pkt->size = 0; |
| } |
| |
| return 0; |
| fail: |
| av_packet_unref(pkt); |
| return ret; |
| } |
| |
| static const enum AVCodecID codec_ids[] = { |
| AV_CODEC_ID_EAC3, AV_CODEC_ID_NONE, |
| }; |
| |
| const AVBitStreamFilter ff_eac3_core_bsf = { |
| .name = "eac3_core", |
| .filter = eac3_core_filter, |
| .codec_ids = codec_ids, |
| }; |